how does anyone anywhere know their partner is not doing 'stuff' on the side? happens the world over.
my tuppence worth; over 20 years on and off in thailand, never paid for anyone to be my girlfriend/friend, never been expected to pay, usually dated thai chinese, have dated lawyers, doctor, physiotherapist, car designer, hospital director, business owners, am currently dating a business owner, 15 years my junior, educated in australia and france, flies regularly for work to aus/usa/uk in business class.
basically i date similar women here that i dated back home.